单项选择题

Because of difficulties in getting a visa, the students had to ______ the idea of applying for study in the United States.

A. reduce
B. yield
C. relinquish
D. waver
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单项选择题
We are convinced that we are on the （）of an important discovery.

A. threshold
B. household
C. thread
D. entrance
单项选择题
Mass transportation revised the social and economic, fabric of the American city in many ways so as to permit an easy row of traffic（）

A. texture
B. textile
C. network
D. structure
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